FIRST PEOPLE TO TESTIFY IS COMMISSIONER ED DAVIS. AND PAM FROM THE GROWING MEMORIAL AT COPLEY SQUARE. WHAT ARE YOU EXPECTING? THE COMMISSIONER SAYS HE'S PROUD OF THE JOB HIS TEAM DID. YES, WE ARE AT THE MEMORIAL AND DESPITE TODAY'S INCLIMATE WEATHER, A STEADY STREAM OF VISITORS, AND HE DOESN'T WANT TO FORGET. AND FOUR PEOPLE KILLED IN THE ATTACKS AND HUNDREDS INJURED AND WANT THE PUBLIC TO UNDERSTAND HOW THEY WERE FOR THE RESPONSE. SOON AFTER THE SUSPECTS WERE IDENTIFIED, THE BLAME GAME BEGAN, WHICH AGENCIES SHOULD HAVE KNOWN THE BROTHERS WERE POTENTIALLY DANGEROUS. AND THE COMMISSIONER CREDITS LONGSTANDING COOPERATION BETWEEN FEDERAL AGENTS AND HE WANTS AN UNFLINCHING LOOK BACK. THE FACTS AND CIRCUMSTANCES OF WHO KNEW WHAT WHEN, AND WE DON'T HAVE THE FINAL REPORT ON THAT. TO DATE-- THE TRIBUTES HAVE BEEN RELOCATED AND COVERED FOR THE RAIN AND ATTRACT MANY TRYING TO PROCESS WHAT HAPPENED. FOR LAW ENFORCEMENT, PROCESSING OR REVIEWING REALLY MEANS PLANNING FOR THE FUTURE. THERE'S GOING TO BE A LOT OF CRITICISM FOR PEOPLE, AS THERE ALWAYS IS AFTER AN EVENT OF THIS MAGNITUDE. RIGHT NOW, WE NEED THE FACTS ON THE TABLE AND MAKE DECISIONS, THE F.B.I., AND THE INTELLIGENCE AGENCIES AND I THINK EVERYBODY IN AMERICA IS IS LOOKING AT WHAT THEY DID BEFORE THIS HAPPENED, TO ENSURE IT DOESN'T HAPPEN AGAIN. AND COMMISSIONER DAVIS NOT ALONE, THE UNDERSECRETARY OF HOMELAND SECURITY ALSO EXPECTED TO TESTIFY IN CONGRESS TOMORROW. COMMITTEE MEMBERS HAVE SAID THEY

A day after Trevor Noah was declared the new host of "The Daily Show," complete with the blessing of the exiting Jon Stewart, graphic tweets targeting women, Jews and victims of the Ebola virus are causing a social media backlash.